DelayQueue的iterator()方法用于在DelayQueue中的所有元素上返回迭代器。这些元素可以过期或未过期。
用法:
public Iterator iterator ()
参数:此方法不接受任何参数。
返回值:此方法返回此延迟队列中元素的迭代器。
下面的程序来说明Java中的DelayQueue iterator():
例:
// Java Program Demonstrate DelayQueue iterator() method
import java.util.concurrent.*;
import java.util.*;
// The DelayObject for DelayQueue
// It must implement Delayed and
// its getDelay() and compareTo() method
class DelayObject implements Delayed {
private String name;
private long time;
// Contructor of DelayObject
public DelayObject(String name, long delayTime)
{
this.name = name;
this.time = System.currentTimeMillis()
+ delayTime;
}
// Implementing getDelay() method of Delayed
@Override
public long getDelay(TimeUnit unit)
{
long diff = time - System.currentTimeMillis();
return unit.convert(diff, TimeUnit.MILLISECONDS);
}
// Implementing compareTo() method of Delayed
@Override
public int compareTo(Delayed obj)
{
if (this.time < ((DelayObject)obj).time) {
return -1;
}
if (this.time > ((DelayObject)obj).time) {
return 1;
}
return 0;
}
// Implementing toString() method of Delayed
@Override
public String toString()
{
return "\n{"
+ " " + name + ", time=" + time + "}";
}
}
// Driver Class
public class GFG {
public static void main(String[] args) throws InterruptedException
{
// create object of DelayQueue
// using DelayQueue() constructor
BlockingQueue<DelayObject> DQ
= new DelayQueue<DelayObject>();
// Add numbers to end of DelayQueue
// using add() method
DQ.add(new DelayObject("A", 1));
DQ.add(new DelayObject("B", 2));
DQ.add(new DelayObject("C", 3));
DQ.add(new DelayObject("D", 4));
// Creating an iterator
Iterator val = DQ.iterator();
// print the value after iterating DelayQueue
System.out.println("The iterator values are: ");
while (val.hasNext()) {
System.out.println(val.next());
}
}
}
输出:
The iterator values are: { A, time=1545818784540} { B, time=1545818784541} { C, time=1545818784542} { D, time=1545818784543}
相关用法
- Java DelayQueue take()用法及代码示例
- Java DelayQueue put()用法及代码示例
- Java DelayQueue add()用法及代码示例
- Java DelayQueue toArray()用法及代码示例
- Java DelayQueue remainingCapacity()用法及代码示例
- Java DelayQueue peak()用法及代码示例
- Java DelayQueue offer()用法及代码示例
- Java DelayQueue drainTo()用法及代码示例
- Java DelayQueue poll()用法及代码示例
- Java DelayQueue size()用法及代码示例
- Java Set iterator()用法及代码示例
- Java BlockingDeque iterator()用法及代码示例
- Java SortedSet iterator()用法及代码示例
- Java AbsractCollection iterator()用法及代码示例
- Java ArrayList iterator()用法及代码示例
注:本文由纯净天空筛选整理自ProgrammerAnvesh大神的英文原创作品 DelayQueue iterator() method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。